added support for other platforms

justfile

@@ -3,28 +3,38 @@ set quiet := true
 OS_NAME   := os()
 ARCH_NAME := arch()
 
-OVMF_ARM := if OS_NAME == "macos" {
-    if ARCH_NAME == "aarch64" {
-        "/opt/homebrew/share/qemu/edk2-aarch64-code.fd"
-    } else {
-        "/usr/local/share/qemu/edk2-aarch64-code.fd"
-    }
-} else {
-    "/usr/share/edk2/aarch64/QEMU_EFI.fd"
-}
-
-ACCEL := if OS_NAME == "macos" {
-    if ARCH_NAME == "aarch64" { "-accel hvf" } else { "" }
-} else {
-    ""
-}
-
+# Homebrew prefix (arm64 mac vs x86_64 mac)
 HB_PREFIX := if ARCH_NAME == "aarch64" { "/opt/homebrew" } else { "/usr/local" }
 export PATH := HB_PREFIX + "/bin:" + HB_PREFIX + "/sbin:" + env_var("PATH")
 
-ACCEL_INFO := if ACCEL == "" { "none (TCG)" } else { ACCEL }
+# QEMU acceleration: HVF on Apple Silicon, KVM on aarch64 Linux, TCG otherwise
+ACCEL := if OS_NAME == "macos" {
+    if ARCH_NAME == "aarch64" { "-accel hvf" } else { "" }
+} else {
+    if ARCH_NAME == "aarch64" { "-accel kvm" } else { "" }
+}
 
-CPU := if ARCH_NAME == "aarch64" { "host" } else { "max" } 
+# CPU type: "host" with hardware virt, "max" for cross-arch TCG
+CPU := if ARCH_NAME == "aarch64" { "host" } else { "max" }
+
+# AArch64 UEFI firmware
+# Linux default is Fedora/RHEL path; override via OVMF_PATH env var:
+#   Debian/Ubuntu: /usr/share/qemu-efi-aarch64/QEMU_EFI.fd
+#   Arch:          /usr/share/edk2-armvirt/aarch64/QEMU_CODE.fd
+OVMF_ARM := if OS_NAME == "macos" {
+    HB_PREFIX + "/share/qemu/edk2-aarch64-code.fd"
+} else {
+    env_var_or_default("OVMF_PATH", "/usr/share/edk2/aarch64/QEMU_EFI.fd")
+}
+
+# Display backend
+DISPLAY_FLAGS := if OS_NAME == "macos" {
+    "-display cocoa,show-cursor=on"
+} else {
+    env_var_or_default("QEMU_DISPLAY", "-display sdl")
+}
+
+ACCEL_INFO := if ACCEL == "" { "none (TCG)" } else { ACCEL }
 
 export BUILD_DIR := justfile_directory() + "/.build"
 export TEMP_DIR  := BUILD_DIR + "/temp"
@@ -56,18 +66,18 @@ _prep:
     @mcopy -i {{IMG_FILE}} {{BUILD_DIR}}/Kernel/ksOSKernel.bin ::/ksOSKernel.bin
 
 @run: _image
-    @echo "🚀 Launching..."
+    @echo "🚀 Launching (accel: {{ACCEL_INFO}})..."
     qemu-system-aarch64 {{ACCEL}} \
         -machine virt,acpi=off \
         -cpu {{CPU}} \
         -m 512M \
         -device ramfb \
-        -display cocoa,show-cursor=on \
+        {{DISPLAY_FLAGS}} \
         -drive if=pflash,format=raw,readonly=on,file={{OVMF_ARM}} \
         -drive file={{IMG_FILE}},format=raw,if=none,id=hd0 \
         -device virtio-blk-device,drive=hd0 \
         -serial stdio \
         -monitor telnet:127.0.0.1:5555,server,nowait
-        
+
 @clean:
-    rm -rf {{BUILD_DIR}}
+    rm -rf {{BUILD_DIR}}